The Magpul PRS (Precision Rifle / Sniper AR15/M16 Model) is a drop-in, precision-adjustable butt stock for rifles with A1 / A2 fixed stocks. Designed to offer the fine-tuned, customized feel of a precision target stock, the PRS? is adjustable for both cheek riser height and length-of-pull without sacrificing the durability necessary to withstand the operational environment. Compared to the A2 stock, the PRS? can shorten the LOP by 0.25? or extend it by 0.75?. Machined aluminum adjustment knobs feature positive-locking click detents to maintain position under recoil and allows easy, tool-less adjustments by simply rotating the knobs. Machined aluminum butt-plate and alloy steel adjustment shaft provide stability and strength to withstand severe impact conditions. Rubber butt-pad offers positive shoulder purchase to prevent slippage for optimal accuracy even with body armor or modular gear. Bottom Picatinny-type rail allows for monopod use, additional sling mounts or storage. Stock includes all mounting hardware for A1 / A2 type rifles with fixed stock.